Exhaust Note

practice89 · 04-22-2013, 09:10 AM

Every time during a cold start, my exhaust sound like there's something rattling something similiar to a tin can? lol but it ends up sounding normal again after a minute.

Was wondering if this is normal (hopefully not), if not, what can be wrong with it?

Thanks.

Dark_Knight_335 · 04-22-2013, 09:52 AM

Normal. Do you have a 335? If so, that's the turbos getting all toasty and happy.

CombatNinja · 04-22-2013, 07:14 PM

Vacuum-actuated flap valve inside the muffler to quiet the exhaust on cold start. 90% of the one I hear make noise on startup to varying degrees. Unplug the connector behind the driver's side tail light in the trunk. Now al you will hear is loud exhaust noise instead of a metallic rattle. Pick your poison.

04-22-2013, 09:10 AM	#1
practice89 Private 2 Rep 87 Posts Drives: 2022 X6 M50i Join Date: Mar 2013 Location: United States iTrader: (-1)	Exhaust Note Every time during a cold start, my exhaust sound like there's something rattling something similiar to a tin can? lol but it ends up sounding normal again after a minute. Was wondering if this is normal (hopefully not), if not, what can be wrong with it? Thanks.
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04-22-2013, 09:52 AM	#2
Dark_Knight_335 Came to the N55 Darkside 1131 Rep 12,740 Posts Drives: 2011 335 E93 M-Sport Join Date: May 2010 Location: NY/NJ iTrader: (28)	Normal. Do you have a 335? If so, that's the turbos getting all toasty and happy.
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04-22-2013, 07:14 PM	#3
CombatNinja Banned 50 Rep 1,556 Posts Drives: e91 328i, e90 328i, e90 335i Join Date: Feb 2011 Location: United States iTrader: (0)	Vacuum-actuated flap valve inside the muffler to quiet the exhaust on cold start. 90% of the one I hear make noise on startup to varying degrees. Unplug the connector behind the driver's side tail light in the trunk. Now al you will hear is loud exhaust noise instead of a metallic rattle. Pick your poison.
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